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        <h2 class="post-title" itemprop="name headline">javascript原形链的自我理解

          
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        <h3 id="Object-和-Function"><a href="#Object-和-Function" class="headerlink" title="Object 和 Function"></a>Object 和 Function</h3><p>首先在 javascript 中 我们要明确Object 和 Function两个概念:</p>
<ul>
<li><p>万物皆对象</p>
</li>
<li><p>所有对象都是函数创建出来</p>
</li>
</ul>
<p>仔细琢磨这两句话, 其实说的 Object 和 Function 是一个鸡生蛋还是蛋生鸡的问题. 为什么这么讲呢? 因为函数也是一个对象, 但对象又是函数创建出来的. </p>
<p> 其实原形链的一切江湖恩怨都是围绕着Function和Object两大家族展开的.</p>
<a id="more"></a>

<h3 id="鸡家族和蛋家族"><a href="#鸡家族和蛋家族" class="headerlink" title="鸡家族和蛋家族"></a>鸡家族和蛋家族</h3><ul>
<li><p>有创造力的函数我们称为Function鸡家族, 没有创造力的对象我们称为Object蛋家族</p>
</li>
<li><p>芸芸众生,你我她都是一个蛋对象(~~). 我们都是被某一个函数创建出来, 我们可以称为创建我们的这个函数为鸡爸爸, 我们每人都有一个鸡爸爸</p>
</li>
<li><p>注意创建我们的鸡爸爸函数, 也是一个对象. 它曾经也是被某一个函数创建出来的</p>
</li>
</ul>
<h3 id="prototype鸡技能仓库"><a href="#prototype鸡技能仓库" class="headerlink" title="prototype鸡技能仓库"></a>prototype鸡技能仓库</h3><ul>
<li><p>prototype 是 Function鸡家族独有的技能仓库, 没有创造能力的蛋家族没有这个仓库.</p>
</li>
<li><p>鸡技能仓库内放着鸡爸爸的属性和函数等技能. 例如吃小米、捉虫子、变凤凰…</p>
</li>
<li><p>注意鸡技能仓库属于 Object蛋家族,  因为鸡技能仓库没有创造能力, 鸡才有创造力</p>
</li>
</ul>
<p>OK, 创建我们的鸡爸爸它拥有 prototype 属性.  意味着每个鸡都拥有一个技能仓库, 仓库的大门上也写着拥有者名字(constructor属性), 即这个鸡本人的名字</p>
<ul>
<li>prototype 是鸡的属性, 而constructor是鸡技能仓库的属性</li>
</ul>
<h3 id="proto-拥有鸡爸爸技能仓库的钥匙"><a href="#proto-拥有鸡爸爸技能仓库的钥匙" class="headerlink" title="_proto_ 拥有鸡爸爸技能仓库的钥匙"></a>_<em>proto_</em> 拥有鸡爸爸技能仓库的钥匙</h3><ul>
<li><p>_<em>proto_</em> 是一个隐藏的指针, 万物皆有这个指针. 我们可以将这个 _<em>proto_</em> 理解为 我拿着一把我鸡爸爸技能仓库的钥匙</p>
</li>
<li><p>我拿了一把鸡爸爸技能仓库钥匙, 意味着我可以使用鸡爸爸技能仓库的技能,  例如吃小米、捉虫子、变凤凰…</p>
</li>
</ul>
<p>那么鸡的 _<em>proto_</em> 指向谁? 鸡技能仓库的  _<em>proto_</em> 又指向谁?</p>
<ul>
<li><p>创建鸡(函数家族)的鸡爸爸 是function Function(),  所以鸡的  _<em>proto_</em> 指向 Function.prototype</p>
</li>
<li><p>创建鸡仓库(对象家族)的鸡爸爸是function  Object(), 所以鸡仓库的  _<em>proto_</em> 指向 Object.prototype</p>
</li>
<li><p>最后 Object. __proto__指向了 null</p>
</li>
</ul>
<p>OK, 如果我调用一个函数, 那么先在我身上找这个函数. </p>
<p>如果没找到, 就拿起我的钥匙去我鸡爸爸的技能仓库去找.</p>
<p>如果还没找到, 就拿起技能仓库对象的钥匙, 去仓库对象鸡爸爸的技能仓库去找, 一直找到 null为止.</p>
<h3 id="分析一张图"><a href="#分析一张图" class="headerlink" title="分析一张图"></a>分析一张图</h3><p><img src="/p/6d00c950/1.png" alt="img"></p>
<p>上面部分:</p>
<ul>
<li><p>f1 = new Foo()  我是f1, 没有prototype仓库,  我的  _<em>proto_</em> 指向了鸡爸爸的仓库 Foo.prototype</p>
</li>
<li><p>鸡爸爸(Function Foo)的技能仓库(prototype)是 Foo.prototype, 仓库的名字(constructor)是 function Foo()</p>
</li>
<li><p>鸡技能仓库Foo.prototype的 _<em>proto_</em> 指向了 Object.prototype,  Object.prototype的  _<em>proto_</em> 指向了 null (前面已经提过)</p>
</li>
</ul>
<p>左侧部分:</p>
<ul>
<li>function Foo的鸡爸爸是 function Function(), 因为是这个函数创建了鸡爸爸, 所以 Function Foo的 __proto__指向了 Function.prototype 仓库</li>
<li>再看function Function()  它的技能仓库是 Function.prototype, 技能仓库名字是 function Function() .  另外过分的是function Function() 是被它自己function Function()创建出来的, 所以它的 __proto__指向了自己的技能仓库</li>
</ul>
<p>中间部分: </p>
<ul>
<li>function Object的  _<em>proto_</em>  指向了Function.prototype 看来所有鸡的钥匙都指向了Function.prototype</li>
<li>技能仓库Function.prototype的 _<em>proto_</em> 指向了 Object.prototype,  Object.prototype的  _<em>proto_</em> 指向了 null </li>
</ul>
<h3 id="instanceof-寻仓库运算符"><a href="#instanceof-寻仓库运算符" class="headerlink" title="instanceof 寻仓库运算符"></a>instanceof 寻仓库运算符</h3><p>instanceof运算符的第一个变量是一个对象(蛋家族)，暂时称为A；第二个变量一般是一个函数(鸡家族)，暂时称为B。</p>
<p>Instanceof的判断队则是：沿着A的 _<em>proto_</em> 这条线来找，同时沿着B的prototype这条线来找，如果两条线能找到同一个引用，即同一个对象，那么就返回true。如果找到终点还未重合，则返回false。</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">console</span>.log(<span class="built_in">Object</span> <span class="keyword">instanceof</span> <span class="built_in">Function</span>); <span class="comment">//true</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">Function</span> <span class="keyword">instanceof</span> <span class="built_in">Object</span>); <span class="comment">//true</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">Function</span> <span class="keyword">instanceof</span> <span class="built_in">Function</span>); <span class="comment">//true</span></span><br></pre></td></tr></table></figure>


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